The Echinoid Directory

Gisopygus Gauthier, in Fourtau, 1899, p. 648

Diagnostic Features
  • Test of medium size, oval, elongate.
  • Apical system anterior; monobasal with four gonopores.
  • Petals lanceolate, converging distally but not closed. Columns of pore pairs in each petal of unequal length.
  • Ambulacra single pored beyond petals.
  • Periproct oval, transverse; supraambital in position with a short subanal shelf.
  • Peristome anterior, pentagonal, floscelle well developed.
  • Short transverse bourrelets weakly projecting.
  • Phyllodes single pored, arrangement unknown.
  • Tubercles very small aborally, distinctly larger on the oral surface with enlarged scrobicules.
Lower Eocene of Egypt and Madagascar; Middle Eocene of Pakistan according to Kier (1962).
Name gender masculine
Rhynchopygus navillei De Loriol, 1881, p. 85, by subsequent designation of Lambert & Thiery, 1921, p. 365.
Species Included
  • G. navillei (de Loriol, 1881): Lower Eocene, Egypt.
Classification and/or Status

Irregularia; Cassiduloida; Cassidulidae.

Subjective junior synonym of Rhyncholampas A. Agassiz, 1869.


Kier (1962) treated this as a synonym of Rhyncholampas, where as previous authors treated it as a synonym of Eurhodia.

Gauthier, in Fourtau, R. 1899. Revision des echinides fossiles de l'Egypte. Memoires de l'Institut egyptien, fasc. 8, serie 3, p. 678-681, pl. 2, figs 5, 6.

P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections 144 (3) 262 pp.

P. De Loriol. 1881. Monographie des echinides contenus dans les Couches Nummultiques de l' Egypte. Memoires de la Societe Physique d\' Histoire Naturelle, Geneve 27, pp. 59-148, 11 pls.

J. Roman & A. Strougo. 1994. Echinoides du Libyen (Eocene Inferieur) d' Egypte. Revue de Paleobiologie 13 (1), 29-57.